XML 24 R44.htm IDEA: XBRL DOCUMENT v2.4.1.9

Acquisitions (Acquisitions Costs, by Acquisition) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015
Business Acquisition [Line Items]
Potential future earn-out obligations	$ 11.0asgn_Contingentconsiderationmaximum

X

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents the maximum amount of consideration which may be paid.

+ References

No definition available.

+ Details

Name:	asgn_Contingentconsiderationmaximum
Namespace Prefix:	asgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration